Talking-machine drive



EEC-L1 1 Dec. 3, 1929. L L. BANCALARI r 1,733,417

TALKING MACHINE DRIVE Filed Aug. 15, 1927 4 Sheets-Sheet 1 Zj-rvyamfoz qnacio L BancaZar/ri,

D 3 1929. L. BANCALARI 1,738,4 7

TALKING MACHINE DRIVE Filed Aug. 15, 1927 4 Sheets-Sheet Z l 1 Q t}\. N i Q 4 D a 5 c Bk 1 w I 6 f glwuem rof {5 u a 4 x g H MW Dec. 3, 1929. 1. 1.. BANCALARI TALKING MACHINE DRIVE Filed Aug. i5, 192? 4 Sheet s-Sheet 3 Pa NH MH Dec. 3, 1929. i. L. BANCALARI TALKING MACHINE DRIVE Filed Aug. 15,' 1927 4 Sheets-Sheet 4 UH WH PI Patented Dec. 3, 1929 snail? li'i'rltlllCIG LlllPlilfl BANGARART OF MEYTGO, TW'FFYTCO TALIKIJHG-MACHINE DRIVE Application August 15, 199?, Serial N0. 213,082, and in Mexico May S, 1927.

This invention refers to driving mechanism for souiul-rccording and reproducing inachines which will facilitate the recording as Well as the reproducing; of records in a con- 5 tinuous manner, whereby it will be possible first to record and then to reproduce a complete musical compos' on oi any duration, using a series of records. It may be applied to any type of machine and With any kind s of motor.

The object of my invention is to make it possible to start playing a new record at the some moment when the previous one stops, reducing the time between the tWo operations to a minimum, in order to give the impression of continued reproduction, and for this reason the apparatus must necessarily have to independent record carriers or turntables. C ne of these is motionless When the other 18 running, so that 1t1s possible to place the next record thereon, change the stylus either for recording or for repuoducing, and prepare in the manner to be described the performance of this second record which, 1313 with the use of the present mechanism, Will start automatically as soon as the first record The latter is then removed from its r \vuich, in turn, Will remain motionwhile the second record is rotating, thus so enabling the preparation the third record, and so on. In other Words ii, on the first turntable, are recorded or reproduced records of uneven inunbers, then on the second turntable or :errier the recorcs of even numbers ill be recorded or l'OPlOClllCQCl. Therefore, in order to tone advantage of both faces of the records in the recording of a musical composition, said records must be recorded alternately on the two carriers, so that one record will contain parts 1 and 3; the next, parts 2 and l; the third, parts 5 and 7; and the fourth, parts 6 and 8 and so on, until the Whole musical composition has been recorded or reproduced. Thus it Will be unde tood that in order to use the actual double re \"vith my machine, two sets of records Wl but in that case they Will, of e, last longer.

7 .ie accompanying drawings: ure 1 1s a hormontal sectional view of machine embodying my invention, taken on line l-1 of Fig. 2;

I Big. 2- IS a longitudinal vertical sectlon on line 2-2, Fig. 1;

l: 1g. 1s a vertical cross-sect1on on line 33, Fig. 2;

Fig-re is a plan view of one of the carriages COJHPHSBCl in the machine;

Fig. 5 is a vertical section on line 55,

1t" 0' ll.

e: t i

l 1g. 0 11s an enlarged, fragmented horizontal section on line (i -6, Fig. 5;

ll r is o trout View of the two scale rods usec for the carriages;

gs. 8 and 9 are, respectively, a perspective view and a vertical section illustrating one of the depressible elements or catches Which are employed;

Fig. 10 is a side view of the traveler and connected parts;

Fig. 11 is an enlarged detoil View showing one of the tripping rollers and one of the rockers curred by the traveler;

Fig. 1.2 is a side View of the rocker, and 13 a perspective View of one of the cams which coact with the rockers;

.Fi 14 is a side view of one of the direction clutches for controlling the direction of rotation of the screw shaft;

Figs. 15 end 16 are an inner face view and i a cross-section, respectively, of one element of the direction clutch; and

l ig. 17 is a :face view of the other element.

'lhe principle on which the improved machine is based, is that oi transforming the rotary movement of one element into linear movement of another element, so that for a predetermined number of revolutions of the iii t element the second element will have been caused to travel a proportional linear distance in one direction. n the p esent instance, tlio principle stated is applied to obtain as nearly as possible a perfectsynchronization of two rotating; elements (the record carriers or turntables) which operate in alternation, both elements being driven in the some direction which, in the case of a sound recording or reproducing machine, is neccs- :rily clockwise.

In the construction illustrated, the main shaft 1 of the machine is driven continuously in a clockwise direction by a suitable motor (not shown) through the intermediate of a gear train, one member 2 of which is mounted directly on said shaft; the arrangement bemg such that the shaft is rotated at the same speed as that at which the turntables 3 and time. Shaft 1 is provided with a plurality of long keyways 5 to permit a sliding as well as a rotary movement of the parts mounted thereon, as explained later on; but the gear 2 is held against sliding movement by means of a pair of bearing brackets 6 which are fixed to the base 7 of the framework at opposite sides of said gear.

A tubular shaft 8 is fitted over shaft 1 to slide thereon with slight friction, and is formed in two parts or sections which are provided with keyways 9 and are connected at their inner ends with a pair of tables or carriages 10. The latter are supported at 01 posite sides on depending legs 11 carrying rollers 12 at their lower ends that travel along longitudinal grooves or tracks 13 in the frame base 7 -Movement of the carriages toward orfrom each other can be effected, for the purpose of setting them initially, by means of screw rods 14 that are engaged in lateral projections 15 on the carriages, said rods extending outside the casing 28 of the machine and having heads whereby they can be turned at ill.

Each carriage 10 has secured to it in verticalposition a collar 16 of U-section (Fig. 5), which is arranged transversely of the earriage and which encircles a driven clutch member 17 attached to the inner end of the respective shaft section 8 by means of keys disposed in the keyways 9. The clutch memher is free to tu n in its collar and, in addition, it is shifted laterally, with the associated shaft section 8, by the traveling movement of the carriage according to the direction of such movement. It is designed to coact with a complemental driving clutch member 18 secured to the main shaft 1 by keys in the long keyways 5 and encircled by a collar 19 which, when required, can be coupled to the carriage to move with the same by spring fastener 20 (Fig. 6). Normally, however, the two collars 19 and, hence, the driving elutchmembers 18 are devoid of positive connection with their carriages so that they can be shifted relatively thereto to engage or disengage the driven clutch members.

It is preferred to connect the two clutch members andfheir related parts together in such a manner as to provide a rigid frame which'is shifted bodily first in one direction and then in the other to couple one clutch and uncouple the other during each stroke or movement. Accordingly, the collars 19 are securely fixed to the intermediate portions of a pair of vertical bars 21 (Fig. 2) mounted to travel in suitable guide grooves or slots (not shown) provided in the top and bottom frame members 22 and 7. The bars 21 have slotted horizontal arms 23 fixed to them which extend inwardly and slidably past each other and are embraced by a clamp 24 that can be tightened from the outside of the machine by means of a headed screw rod 25; and when so tightened, the two bars and the associated parts 19 and 18 will be held at a fixed distance apart which can readily be varied, however, when the clamp is loosened. This ad- ;iustment is entirely independent of the ad- ]ustment of the two carriages by means of the screw rods 14; and to facilitate the positioning of the two bars 21 relatively to each other, a pair of small finger-pieces 26 may be provided which are secured to the two slotted arms 23 and project vertically above the frame top 22.

The collars 19 are set into periphe "a1 grooves formed in the clutch members 18, so that each said clutch member and its collar will necessarily move together laterally, while still permitting the clutch member itself to rotate relatively to the collar with slight friction. The finger-pieces 26 can be used to shift the aforementioned frame so as to effect the initial engagement of the driving and driven clutch members before playing (or recording) the first record, but thereafter the shifting takes place automatically and produces the opening and closing of the clutches in alternation in the desired manner.

To enable the initial spacing and adjustment of the two carriages to be obtained with the degree of accuracy required, a pair of small scale rods 27 is provided, which scales are slidably mounted one upon the other in a suitable opening or recess formed in the front panel of the casing 28 and are graduated reversely, as shown in Fig. 7. The zero mark on each scale is alined with the figure on the other scale representing the maximum number of revolutions supposed to be made by the records of largest size-in this instance, 300-so that the normal spacing will thus be assumed to be 300 divisions of the scale. The two zeros, moreover, are arranged in the vertical planes of the teeth 30 of two pairs of depressible catches or triggers 29 mounted in seats or recesses 31 in the tops of the carriages 10 at opposite sides of the clutches, as will be explained more fully hereinafter. The scale rods 27 are attached directly to the outer ends of a pair of horizontal arms 32 which extend forward from the proieetions or lugs 15 whereto they are integrally connected, so that the adjustment of the carriages by the rods 14 necessarily effects that of the scales as well.

The actual movements of the frame for shifting the movable or driving clutch members 18 are produced by the action of a. pair of expansible coil springs 33 (Fig. which are housed in casings 34 mounted. on the carriages and through which the main shaft 1 passes. These casings are closed at their outer ends and provided at their inner ends with cover plates 35 against which the springs 33 exert their action; said plates being arranged to push t 1e clutch members into engagement with the loose members 16 on being released from the catches 29. The latter are yieldingly held in raised position by springs 36 which are disposed in seats 31 and press them upward to the extent permitted by the stop shoulders 37 provided on the catches; and the previously-mentioned teeth on the catches normally engage the lower corners of the plates but release them when the catches are depressed, whereupon the springs 33 act in the manner indicated. It will be understood, of course, that the plates are released in alternation, and that the released plate closes the as ociated clutch and, at the same time, shifts the clutch frame accordingly thereby opening the other clutch and re-engaging the plate associated with. the latter clutch with the corresponding catch. Both pairs of catches are provided with inclined faces or cams 38 which are located beyond or outside the teeth 30 and serve to produce the depression of the catches when traveled over, the inclination of these surfaces being the reverse of that of the locking teeth.

A traveler 39 (Fig. 10) is provided for this purpose, and comprises a nut'like body l0 ntiounted on a threaded horizontal shaft or screw 4:1 and having front and rear arms 4L2 and 43; the former being inclined downward and terminating in a yoke 4A- which is disposed transversely of the machine so as to straddle shaft 1 (see Fig. The front arm of the yoke is formed with a projection l5 to which a horizontal pointer arm 46 is attached; and the front end of this arm 46 extends through and travels in a horizontal slot fl? located in the front wall of the casing above and parallel with the two scale rods 27 and is equipped with a depending pointer 48, thereby enabling the movements of the traveler to be followed with relation to the scales. The screw shaft 41 is journaled in bearings carried by depending hangers 49 secured to the top wall 22 of the framework and is driven from the main shaft 1 in the manner subsequently described; the speed ratio of the screw shaft to that of the record being, say, 1: 3, because the former must rotate alternately in two directions, so that the 1 lower its speed, the easier it will change its direction when a reverse occurs.

The traveler is guided and supported 1n its movements by the engagement of its arms l3 and with slotted, horizontal guide bars or members 50 and 51 which are secured to the rear and front vertical posts 52 that connect the top and bottom members 22 and 7 of the framework, and it will travel laterally in either direction according to the direction of rotation of the screw shaft ll. The purpose of the traveler is two-fold: in the first place, it serves to depress the pair of catches toward which it is moving, so asto release the corresponding plate 35 and enable it to strike against and close the driving clutch member 18; and in the second place, it ire-cocks the actuating spring 33 after it has been tripped to enable the spring to be operated again and to prevent it from blocking or resisting the movement oi the clutch-shifting frame. In other words, it both trips and re-sets the spring; and in. the latter case, it leaves the shiftable clutch member free of the pressure of the spring, so that said member can be moved backward with the other parts of the frame when the other clutch is closed.

To effect these operations, two sets of tie vices are provided on the yoke member A of the traveler; one set consisting of a pair oi? rollers 53 mounted in the forked ends of the yoke (see Figs. 10 and 11), and the other set consisting of a pair of rockers 5i (Fig. 12) pivotaliy mounted intermediate their ends at 05 at right angles to the yoke in a pair of inner forks 56. The rollers 53 are set in line with the inclined surfaces or cam portions 38 of the catches 29 so as to depress the latter during their passage thereover, both catches being actuated simultaneously. The rockers 5% are normally held in horizontal or balanced position by pairs of springs 58 and they are provided with hooks 57 at opposite ends which are designed to act in alternation that is to say, the left-hand pair of hooks acts during the movement of the traveler toward one carriage, and the right-hand pair of books acts during the movement toward the other carriage. The arrangement, however, is such that the two hooks fronting the carriage toward which the traveler is approaching are raised before they reach the plate 35 so that they will pass freely over the upper edge thereof, but will engage said edge and carry the plate backward with them during the reverse movement of the traveler owing to the action of the balancing springs 58.

The operations just described may be obtained by means of a pair of double cams 59 secured to small posts 60 (Fig. 13) which are mounted on the top of each carriage well in advance of the catches 29 at opposite sides of the housing 34: and are positioned in the path of travel of front and rear lateral rollers 79 attached to the corresponding ends of the rockers. In consequence, the rear pair of rollers moving toward a pair of cams will faces of the teeth 30 of the catches.

the Stated briefly, then, the traveler moves first stored to horizontal position.

strike against them before the front hooks reach the striker plate 35 and before the latter will restore the rockers to horizontal posi- I tion, so that when the traveler starts its movement in the other direction, the hooks will catch behind the plate and carry it along with the traveler until it rides over the inclined The latter, of course, will be depressed thereby,

but will snap up into engagement with the plate as soon as said plate passes beyond the teeth, thus holding it in retracted position, with the springs 33 compressed.

I will be understood, necessarily, that the same release and re-engagement of the striker plateoccur at the other end of the machine as the traveler completes its move ment in that direction and starts back again, with the consequent opening and closing of clutches and attendant operations.

in one direction and then in the other along the screw shaft 4.1; and as 1t approaches the end of its course in either threction, 1t depresses the catches toward which it is moving,flwhereupon the corresponding clutch is closed by the action of the striker plate and its spring 33, the rockers 54 having first been tilted so as :to clear the plate and then re- The clutch closing movement produces the movement of the shifting frame in the same direction, thereby opening the clutch at the other end of the machine. The re-setting of the striker plate occurs when the traveler commences its backward movement, and the rockers are engaged therewith; that is to say, in the leftward movement of the traveler, for instance, the left-hand rocker hooks will be raised by the cams to clear the plate, and when the traveler starts to move to the right, the righthandhoo'ks will be raised and the said lefthand hooks will be engaged with the plate and will efiect the retraction of the latter.

' The left-hand pair of rollers is offset inward from 'the right-hand pair, and the cams are so arranged on the two carriages that they will actuate one pair of rollers only; that is to say,"the'cams on the left-handcarriage 'will engage the right-hand rollers, but not the left-hand ones, whereas the cams on the right-hand table will engage the left-hand hooks and will missthe right-hand ones.

It remains now to describe the driving or transmission connections between the main shaft '1, the screw shaft 41 and the vertical shafts 61 and 62 wheretothe turntables 3 and 4 are'secured. As has already been explained, the shaft 1 is driven from the motor through the gear train 2, and it has fitted on it the hollow auxiliary shaft 8 made in two independent sections. Each of these sections has fixed to its inner end a bevel gear (53 which meshes with and drives a similar gear (it on the corresponding turntable shaft; and

the sections themselves are driven in alternation from the main shaft by the system of clutches described above. The aforesaid sections are utilzed to drive the screw shaft through two transmission gearings and an associated system of one-way direction clutches of the type illustrated in Figs. 1417. No movement should be transmitted, however, from the screw shaft to either auxiliary shaft section, nor from either shaft section to its clutch or to the corresponding turntable, this for the purpose of avoiding shocks incidental to coupling and of keeping the inactive turntable stationary. It is to be understood that the extent of movement of the traveler must be determined by the number of revolutions to be made by the record about to be played, which number will be marked on it, so that after a record is placed upon an empty turntable, some adjustment of one or the other scale rod and carriage may be necessary.

The transmission sets are-of such a nature that one willei'lect rotation of the screw shaft in the same direction as the main shaft, while the other set will produce reverse rotation, the first-mentioned or direct drive set comprising three intermeshing gears (35, 66 and 67, and the second or reversing set comprises two intermeshing gears 68 and 69. The two sets are so calculated that the speed. lll'lPlUtQd to the screw shaft is the same in both cases; the gears and (38 being keyed to the auxiliary shaft sections 8, and the gears 67 and 69 being loose on the ends of the screw shaft. Each of the direction or reversing clutches comprises a disk 70 (Figs. 15 and 1(3) keyed to the very end of the shaft and having in its inner face a circular track or groove 71 of T-section from which extends inwardly a. set of small arcuate branch slots 72; the slots in the disk on one end being curved in one direction for a clockwise rotation of the shaft, and those in the other disk being curved in the opposite direction for a counter-clockwise rotation. A companion disk 73 (Fig. 17) is fixed to the gear 67 (as well as to the gear 69) so as to face the outer disk 70, the two disks having the same diameter; and in the outer face of this disk 73 'here are formed four short 'adial slots 74; arranged at 90 apart. The two disks 70 and 73 are coupled by a set of four devices each consisting of a T-shaped head 75 and a retractile helical spring 76, which connects the stem of the T-head to a collar 77 common to all four springs and arranged loosely on the shaft end.

Each of the four heads 7 5 has one arm extending into the groove 71 in disk 70 and the site the 300 other arm engaged in one of the radial slots '74: in disk 73; said arms preferably being equipped with rollers which, however, cannot well be illustrated on account of the scale of the drawings. According as one or the other auxiliary shaft section 8 is coupled by its clutch to the drive shaft 8 and drives the associated gear 67 or 69, the disk 7 3 secured to the gear rotates therewith and carries the four coupling devices around with it, and the springs 76 pull the heads radially inward so that the arms which normally travel in the circular groove or slot 71 are caused to enter the branch slots 72. The rotation of the screw shaft then commences, with the result that the traveler 39 starts to move toward one or the other clutch according to the direction in which the shaft is turning. The coupling devices at the other end of the shaft will, however, be inactive, due to the reverse curvature of the branch slots, for the arms of the T-heads of that set of devices will move out of the branch slots and will merely ride idly in the circular slot 71.

The various mechanisms and their operations having been described with more or less detail, it is believed suflicient to state the com plete operation broadly, as follows: lVhen the machine is used for the first time, both driving clutches are open, and it is necessary, therefore, to close the first clutch by hand, the movable controlling frame originally occupying a neutral position. This can readily be done by pressing slightly against one or the other of the small fingenpieces 26. The corresponding auxiliary shaft section 8 thereupon starts to rotate and transmits its movement through the associated gear train and direction clutch to the screw shaft, 41,

with the result that the traveler 39 commences to move. The turntable connected with the driven shaft section 8 also starts to rotate, but the other turntable remains stationary. The direction of movement of the traveler is indicated on the outside of the machine by the pointer arm 46 and pointer 4.8, the latter moving across the two scale rods 27. The carriage corresponding to the stationary turntable is then positioned by means of its screw rod 14 (the clamp 24 having first been loosened) and, in turn, adjust the scale rod 27 connected to it, to bring its zero mark oppograduation on the other scale, making the middle point of the scale system at 150, Whereafter the clamp 24 is tightened, the first record to be cut or reproduced is placed on the stationary turntable, and the scunctbox is positioned to set the recording or reproducing stylus in the first convolution of the spiral. The traveler continues its movement toward the stationary turntable and ultimately trips the corresponding catches, whereupon the'striker alate 35 closes the adjacent driving clutch in the manner expl med and brings about rctatien of the turntable and the reversal of rotation of the screw shaft. The traveler then commences its movement in the opposite direction, in the course of which the striker plate is re-set.

The closing of the driving clutch ust mentioned entails the opening of the other one, due to the shifting of the controlling frame, so that the turntable which was first rotated now stops and remains stationary. The sec ond record is then placed on the stationary turntable and the same adjustments are then made for that record as for the first one, and so on. Assuming that the operation is one of recording, the number of graduations over which the traveler has passed in completing the recording proper on each record is noted and is marked thereon, so that in playing the records the adjustments are made from these figures. If, however, it were possible to record in the full three hundred convolutions of each blank, it would not be necessary to make an individual adjustment for each, as the stroke or movement of the traveler in each direction would then be always the same. When the motor is stopped at the completion of recording or playing the entire set of records, or at any other desired time, one of the driving clutches will always be closed, and the pointer 48 will indicate the position of the traveler, so that the machine can be re started without requiring any preliminary adjustments.

I claim as my invention 1. An automatic reversing drive, comprising a drive shaft; a pair of driven shafts to be rotated in alternation; a clutch connection between the drive shaft and each driven shaft; a spring-operated striker for closing each clutch; a catch for holding each striker in cocked position; a reciprocating traveler; operating means therefor; means carried by the traveler for releasing a catch at the end of each stroke in either direction, and means for automatically re-setting the released striker at the commencement of the stroke of the traveler in the opposite direction.

2. An automatic reversing drive, comprising a drive shaft; a pair of driven shafts to be rotated in alternation; a clutch connection between the drive shaft and each driven shaft; a spring-operated striker for closing each clutch; a catch for holding each striker in cocked position; a reciprocating traveler operating means therefor; and means carried by the traveler for relasing a catch and striker at the end of each stroke in either direction and automatically resetting the released striker at the beginning of the next stroke.

3. An automatic reversing drive, comprising a drive shaft; a pair of driven shafts to be rotated in alternation; a clutch connection between the drive shaft and each driven shaft; a spring-operated striker for closing each clutch; a catch for holding each striker in an e: pesition; a recipreiizating traveler;

operating means therefor; means carried by the traveler forreleasing a catch and striker at the endof each stroke in either direction and automatically resetting the released striker at the beginning of the next stroke; and connecting means between the two clutches for opening the other clutch when either clutch is closed.

t. An automatic reversing drive, compris ing a main drive shaft; a pair of tubular auxiliary shaft. sections fitted thereon; a clutch between each auxiliary shaft section and j the main shaft; a pair of shafts to be drivcir in alternation; driving gearing between each auxiliary shaft section and the adjacent driven shaft; a traveler reciproctaing between the two clutches for closing one of them at each end of its stroke; a screw shaft whereon the traveler is mounted; and transmission gearing between each auxiliary shaft section and the adjacent end of the screw shaft to drive the latter from the former.

I 5. An automatic reversing drive according to claim 4:, in which each transmission gearing includes a one-way clutch.

g 6. An automatic reversing drive, comprising a main drive shaft; a pair of auxiliary drive shafts; a pair of driven shafts to be rotated in alternation; a clutch bet-ween each auxiliary drive shaft and the main drive shaft; driving gearing between each auxiliary drive shaft and the adjacent driven shaft a traveler reciprocating between the two .clutches for closing one of them at each end of its stroke; a screw shaft whereon the traveler is mounted; andtransmission gearing betweeneach auxiliary. drive shaft and the ad acent end of the screw shaft to drive the latter from the former. i

.7. An automatic reversing drive, compris-.

ing a main drive shaft; a pair of auxiliary drive shafts; a pair of driven shafts to be rotated in alternation; a clutch betweeneach auxiliary drive shaft and the main drive shaft; driving gearing'between each auxilis ary drive shaft and the ad acent driven .shaft;'a traveler reciprocating between the two clutches for closing one of them at each end-of its stroke; a screw shaft W hereon the traveler is mounted; and transm ssion gearthem against closing movement, said catches arranged in the path of the traveler to he released by the sume, one at the end of the movement of the traveler in each direction; and in dividual adjusting means for each catch to vary its position and, hence, its time of operaion.

9. An automatic reversing drive comprising a drive shaft; a pair of driven shafts to be rotated in alternation a clutch connection between each driven shaft and the drive shaft; a catch for holding each clutch in open position; a traveler movable between the two catches for releasing one of them at the end of each movement in either direction; in ans for reciprocating the traveler; and individual means for moving either catch toward or from the traveler to vary the time of its release thereby.

10. An automatic reversing drive, comprising a drive shaft; a pair of driven shafts to be rotated in alternation; a clutch between each driven shaft and the drive shaft embodying stationary and movable members and spring means for producing their engagement; a catch individual to each movable member for preventing its closing movement; a traveler mounted to reciprocate bctweenthe two catches to release one of them at the end of its movement in either direction; and means for ope-rating thetraveler.

11. An automatic reversing drive, comprising a drive shaft; a pair of driven shafts to be rotated in alternation; a clutch between each driven shaft and the drive shaft embodying stationary and movable members and spring means for producing their engagement; a catch individual to each movable member for preventing its closing movement while permitting its opening movement; a rigid connection between the two movable clutch members for causing them to move together as a unit so as to open one clutch when the other closes; a traveler mounted to reciprocate between the two catches to release one of them at the end of its movement in either direction; and means for operating the traveler.

12. An automatic reversing drive, comprising two rotary carriers; a drive shaft; gearing between the drive shaft and the two carriers for driving them in the same direction; clutch means between said shaft and each carrier for controlling the activity of its drive; a traveler disposed between the two clutches; means for reciprocating the traveler; a shifting frame connected with the two clutches for simultaneously opening one and closing the other so as to produce rotation of the two carriers in alteration; and means under the control of the traveler for effecting a movement of the shifting frame to open the clutch of the rotating carrier and close the clutch of the inactive carrier after the former has made a revolutions.

13. An automatic reversing drive, comprising two rotary carriers; a drive shaft; gearing between the drive shaft and the carriers for rotating them in alternation in the same direction and including a pair of reVersely-acu ing clutches; a traveler movable in opposite directions between the tWo clutches; means under the control of the traveler for closing one clutch and simultaneously opening the other; and a pair of settalole devices, one for each clutch, for automatically effecting the opening of the clutch of the carrier then in rotation, by the traveler-controlled means, when that carrier completes a predetermined number of revolutions.

14-. An automatic reversing drive, accord ing to claim 13, in which the two settable devices comprise, each, a movable carriage and a screw rod for adjusting it; and in Which the traveler-controlled means includes a pair of coacting scale rods adjustably connected together, each scale rod also being connected rigidly to one of said carriages.

In testimony whereof I have affixed my signature.

IGNACIO LOPEZ BANOALARI.

predetermined number of 

